Malicious PDF — malware analysis report

Static analysis result for SHA-256 911e231dd6b2cb8e…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 13:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8084afbf6d02c21df52022aa32295266 SHA-1: d5e1275a66706400cfcf5f8c5c538b48da0c23be SHA-256: 911e231dd6b2cb8e477878a5d92b34fe25569ceddaf23ff4ec5b8af4ed674c85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The PDF's structure and the presence of numerous external URIs suggest an attempt to lead the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=1984+george+orwell+movie+watch+online+free
    • http://oembag.com/uploads/files/202109160718255767.pdf
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/91597080825.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161494bfbb9dbd---gadibajanowedigetusaz.pdf
    • http://a2hgghk.handylover.com/upload/files/7789498305.pdf
    • http://brezov-gaj.si/uporabnik/file/19091363406.pdf
    • http://bubb.cn/up_file/file/mabajaleredebepezotalakog.pdf
    • https://alihuata.com/userfiles/file/70665525504.pdf
    • https://alkoplast.rs/files/sixopanofi.pdf
    • http://boxshop.mn/userfiles/files/nomemigo.pdf
    • http://urdu-hadith.com/survey/userfiles/files/6869755862.pdf
    • http://owv-sad.de/userfiles/files/zonafewu.pdf
    • http://3t-t.com/User_File/UpFile/file/20210921192501_a3V6b24=.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/nidirefuw.pdf
    • https://tradingphrases.net/userfiles/files/73785749650.pdf
    • https://hijaustabilo.com/contents/files/digelimowosegukirubora.pdf
    • https://silverbirdmarketing.com/pages/images/file/webapunidozanela.pdf
    • https://allmassage.net/upload/file/20210910230429.pdf
    • http://tdbm.vn/upload/files/48537209631.pdf
    • https://searches.onlineconvey.com/userfiles/file/xupemiduzeg.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d324176d783f707a90828c4b7e87fd98/zogajav.pdf
    • http://travelshops.pl/userfiles/file/96813225479.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab9f.bin
d91e0d40fef4b675ea4d8f339a7c6f317185860a02631b986054a6ad9c1cf0f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB9F 11176 bytes
font_01_sfnt_off0000c5b8.bin
ad2f07026f44237a73450a16f9d7d5479f4461c497f2bf2dd2deb5f846312e92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B8 17068 bytes
font_02_sfnt_off0000f198.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 16792 bytes

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